Abstract

We comment on a Letter by
Toytman et al. [Opt. Lett.
32, 1941 (2007)]
in which a novel setup for wide-field imaging in coherent anti-Stokes Raman scattering (CARS) microscopy is demonstrated. There the authors state that our phase-matching implementation of a wide-field CARS system [
Appl. Phys. Lett.
84, 816 (2004)
;
New J. Phys.
8, 36 (2006)
] suffers from a strong background from the bulk medium. However, our results show quite the contrary, i.e., that our setup provides a very good signal contrast, due to an almost vanishing background level from the bulk solvent.

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